The Energy Price Nobody’s Watching: $6.53

Are Record Diesel Prices Putting the Economy at Risk?

With so much attention focused on crude oil and gasoline prices, the financial media—and by extension, many investors—may be overlooking another energy cost with even broader economic reach: diesel prices.¹

We don’t hear much about diesel prices when we talk about markets, inflation, and the economy, mostly because U.S. households rarely buy it directly. But we all still depend on diesel throughout the day, across many touchpoints. Diesel powers trucks delivering groceries, trains carrying freight, and much of the equipment used in farming and construction. According to preliminary Energy Information Administration data, the U.S. transportation sector consumed about 123 million gallons of petroleum diesel daily in 2025, representing roughly 22% of its energy use.²

It follows that the cost of diesel reaches businesses and households well beyond the filling station. That means when the national average for diesel reaches a record $6.53 per gallon, as it did on September 22, we should all pay some attention.

U.S. Diesel Sales Price

Consider a farmer encountering higher fuel costs while harvesting crops, followed by a higher freight bill to get those crops to market. Or a retailer facing additional delivery expenses across thousands of shipments, and what that means for margins. All told, if higher costs persist, businesses face difficult choices about pricing, profit margins, and how much activity they can sustain.

So far, the inflation data offer some reassurance. The Consumer Price Index excluding energy slowed from 2.9% year-over-year in May to 2.5% in August. This measure still includes food, making it particularly relevant to concerns about agricultural and transportation costs. By comparison, conventional core CPI, which excludes both food and energy, rose 2.4% in August. I want to be fair in disclosing that August’s inflation report predates the latest diesel-price surge, so in my view, September data will really tell us if pressures are legitimately mounting. Keep an eye on that report.

There is also evidence that the economy is absorbing higher costs reasonably well. Producer prices were up 5.4% year-over-year in August, compared with a 3.4% increase in consumer prices. That gap suggests many businesses are absorbing at least some of the increase through margins rather than passing every additional dollar of cost directly to customers.

History also offers some perspective. Diesel prices reached similarly elevated levels in 2022 without tipping the economy into recession, and today’s prices remain below earlier peaks after adjusting for inflation. I would not take that history as a guarantee that today’s increase is harmless, but it does argue against treating $6-plus diesel as an automatic economic breaking point.

There has been some discussion in Washington about restricting U.S. diesel exports as a way to keep more supply at home. I understand the appeal, but the economics don’t really add up, in my view. The U.S. currently produces more diesel than it consumes, and refiners rely on overseas markets for that excess production. If exports were sharply restricted, refiners could eventually respond by processing less crude. If refiners respond by reducing refinery runs, that could also tighten gasoline and jet fuel supplies, since those products are made alongside diesel. That falls in the category of “unintended consequences.”

Policymakers may not need to take such drastic action. As I write, it’s been reported that oil exports from the Persian Gulf increased substantially in September, with an estimated 10 million barrels per day moved through the Strait of Hormuz (up from 5.9 million in August). Another 6 million barrels per day left the region through pipelines and ports that bypass the strait.

Combined, that puts exports at roughly 16 million barrels per day, compared with around 19 million before the war—about 85% of the prewar level. More crude reaching global markets gives refiners more supply to work with and could gradually relieve some of the pressure that has pushed diesel prices higher.

Bottom Line for Investors

What I would watch from here is persistence. If diesel stays near record levels for months and we begin seeing higher transportation costs show up in broader inflation, weaker margins, or softer economic activity, my concern would go up.

At the same time, September’s improvement in Gulf oil flows is a reminder that supply conditions can change quickly. In my view, the key is to avoid getting too far ahead of the data. Diesel prices are a legitimate pressure point, but the improving supply picture gives us reason to see how the next few months unfold before assuming a broader economic impact.

Disclosure

1 U.S. Energy Information Administration. 2026. “Diesel Fuel Explained.”

2 New York Times. September 29, 2026. “Oil Exports Strait of Hormuz.”

3 FRED, Fred Economic Data. September 29, 2026. “US Diesel Sales Price (GASDESW)”

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